hello every one! I just wanted to know what fuel pressure should i run on my 94 LS with the normal I/H/E and a 255 fuel pump msd 6a box and some more goodies . just installed some 93 odb1 H22 injectors and just wanted to know what is a good fuel pressure to run on my set up ?? any good info would be great Thanks!

 

The fuel pressure With vacuum 30 - 37 psi without vacuum 38 - 46 psi.

What are you using to adjust your fuel maps for the injectors? If you put your car on a dyno and tune it properly that will show you what PSI you should be running. With that said, if all you have is I/H/E and no tune. The larger 345cc injectors are probably not going to do anything on an engine under 2.2L. Your short term and long term fuel trim will cut the larger injectors spray time (pulse width) down until you get to stoich Air to Fuel Ratio. (14.7:1 AFR) Or the CEL comes on for running too rich. Or the car starts to bog/stall due to too much fuel.

Note:
Did you install the resistor box for them?

 

thanks for the great info and yes i did put the resistor box on it . now as far as the fuel pressure go's i have turn it down to 43 psi with the vacuum hose off now with the hose hooked up it reads 38-39 psi . but befor that i have played with the fuel pressure long befor i set it when i turn it up to 50 psi the way it was befor putting those injectors in with the stock Ls injectors the car bucks really bad when i go W.O.T . so i just set it at 43 psi and it seem's to be fine so far but do u have any more good info that can help ??